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SONOFF Smart Stackable Power Meter (SPM)
Model: SPM · SKU: SPM
Prepared Nov 12, 2026
Common specifications
| Device type | Not documented |
|---|---|
| Max switched load (A) | Not documented |
| Max switched load (W) | Not documented |
| Measurement channels | up to 128 (32 SPM-4Relays x 4)Source [1] |
| Current sensors | Not documented |
| Current rating | Not documented |
| Voltage range | Not documented |
| Accuracy | Not documented |
| Communications | 802.11 b/g/n 2.4GHzSource [1] |
| Display | Not documented |
| Power input | Not documented |
| Mounting | Not documented |
| Safety listing | Not documented |
| Weight | Not documented |
| Dimensions | Not documented |
| Enclosure volume | Not documented |
| Warranty term | 2 yearsSource [1] |
All recorded specifications
| Communications | 802.11 b/g/n 2.4GHzDocumented claim ConditionsPrinted as "Wi-Fi 802.11 b/g/n 2.4GHz". Location: Product page and documents as quoted Printed as "Wi-Fi 802.11 b/g/n 2.4GHz". Location: Product page and documents as quoted Official product page · SONOFF product page: Smart Stackable Power Meter (captured October 12, 2026) [1] |
|---|---|
| Measurement channels | up to 128 (32 SPM-4Relays x 4)Documented claim ConditionsPrinted as "can control up to 128 channels by connecting to 32 SPM-4Relays. Each channel handles up to 20A". Location: Product page and documents as quoted Printed as "can control up to 128 channels by connecting to 32 SPM-4Relays. Each channel handles up to 20A". Location: Product page and documents as quoted Official product page · SONOFF product page: Smart Stackable Power Meter (captured October 12, 2026) [1] |
Warranty
| Warranty term | 2 yearsDocumented claim ConditionsPrinted as "2-Year Hassle-Free Warranty". Location: page Printed as "2-Year Hassle-Free Warranty". Location: page Official product page · SONOFF product page: Smart Stackable Power Meter (captured October 12, 2026) [1] |
|---|
Certificate records
No records documented.
Sources and revisions
- SONOFF product page: Smart Stackable Power Meter (captured October 12, 2026)Official product page · Checked https://sonoff.tech/products/sonoff-smart-stackable-power-meter
- SONOFF Smart Stackable Power Meter (Main Unit+4-Relays) SPM-Main / SPM-4Relay User manual (V1.0 20210924)Official instruction manual · Checked https://cdn.shopify.com/s/files/1/0742/9963/8001/files/user_manual_SPM-Main_SPM-4Relay_V1.0_20210924.pdf